作业帮php的正则表达式问题$type = preg_replace( '|[^a-z0-9-]+|','',$type );这句的作用
来源：学生作业帮助网 编辑：作业帮 时间：2024/09/30 20:48:38
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php的正则表达式问题$type = preg_replace( '|[^a-z0-9-]+|','',$type );这句的作用
php的正则表达式问题$type = preg_replace( '|[^a-z0-9-]+|','',$type );这句的作用
php的正则表达式问题$type = preg_replace( '|[^a-z0-9-]+|','',$type );这句的作用
把字符串为$type其中除了a-z,0-9,-,的东西全部替换成空白.等于就是说只在字符串中保留a-z0-9-这些字符